My Betta has had clamped fins every since i got him, and i have no idea why. He had fin rot a couple weeks ago, but his fin rot is gone after i put him in aquarium salt for 5 days. His fins are never straight up, and they never extend, they are just clamped... I got my Betta about 2 months ago.

Housing
What size is your tank? 5 gallons. (2.5 gallons divided)
What temperature is your tank? 80 degrees F.
Does your tank have a filter? Yes.
Does your tank have an air stone or other type of aeration? No.
Is your tank heated? Yes.
What tank mates does your betta fish live with? None, all he has is another betta at the other side of the tank, the tank is divided.

Food
What type of food do you feed your betta fish? Tetra mini pellets, i usually crush them because they are too big, hence the name "mini" pretty ironic.
How often do you feed your betta fish? 2-3 pellets a day. I feed him 1 pellet in the morning and 2 at night.

Maintenance
How often do you perform a water change? Once a week.
What percentage of the water do you change when you perform a water change? 25%
What type of additives do you add to the water when you perform a water change? Water conditioner, the brand is Tetra BettaSafe.

Water Parameters:
Have you tested your water? If so, what are the following parameters?

Symptoms and Treatment
How has your betta fish's appearance changed? Fins are clamped.
How has your betta fish's behavior changed? His behavior hasn't really changed much.
When did you start noticing the symptoms? I have no idea.
Have you started treating your fish? If so, how? His fins have been clamped since i got him. I haven't really been treating his clamped fins. But when he got fin rot, i treated him with aquarium salt.
Does your fish have any history of being ill? Yes, he has gotten fin rot in the past, but his fins have been clamped way before he got fin rot.
How old is your fish (approximately)? Don't know, a little less than a year because of his size. But i got him 2 months ago. But i have no idea how old he is. My guess is a little less than a year.

I would start feeding higher quality food like new life spectrum or omega one pellets, and do a fifty percent water change a week.

The food i feed him is high quality. All his food is from the Tetra brand. I feed him bloodworms and pellets, i never feed him flakes. And i don't think food is the problem here, his fins have always been clamped, ever since i got him.

See how flour, fish meal, and gluten are the first three ingredients? All three of those are cheap fillers. Then, the list goes on to include soy, corn, and potato... None of which should be fed to a betta. Cheap food is, well, cheap.

See how flour, fish meal, and gluten are the first three ingredients? All three of those are cheap fillers. Then, the list goes on to include soy, corn, and potato... None of which should be fed to a betta. Cheap food is, well, cheap.